mirror of
https://github.com/apache/doris.git
synced 2026-11-04 07:31:17 +00:00
linrrarity
ac6d282671
### Key Optimizations - Reworked exact percentile state into a simpler `values + PercentileLevels + inited_flag` layout. - Removed the old Counts-based exact percentile path and replaced it with a lightweight `PercentileLevels` metadata structure. - Reduced add-path overhead by directly appending values into a contiguous buffer and initializing `percentile levels` only once. - Optimized multi-quantile finalize(`percentile_array`) by sorting quantiles through permutation once, then reusing incremental `nth_element` selection. ### Performance before: ```text Doris> select percentile(FUniqID, 0.91) from hits_100m; +---------------------------+ | percentile(FUniqID, 0.91) | +---------------------------+ | 8.749975206154981e+18 | +---------------------------+ 1 row in set (6.149 sec) Doris> select percentile_array(FUniqID, [0.12, 0.23, 0.34, 0.45, 0.56]) from hits_100m; +------------------------------------------------------------------------------------------------+ | percentile_array(FUniqID, [0.12, 0.23, 0.34, 0.45, 0.56]) | +------------------------------------------------------------------------------------------------+ | [0, 5.097819197233503e+18, 5.68906185719365e+18, 6.281280528073601e+18, 6.869583632113269e+18] | +------------------------------------------------------------------------------------------------+ 1 row in set (28.984 sec) Doris> select percentile_array(FUniqID, [0.12, 0.23, 0.34, 0.45, 0.56, 0.67, 0.78, 0.89, 0.91]) from hits_100m; ERROR 1105 (HY000): errCode = 2, detailMessage = (127.0.0.1)[E-3113]string column length is too large: total_length=7200000149, element_number=0, rows=0 ``` now ```text Doris> select percentile(FUniqID, 0.91) from hits_100m; +---------------------------+ | percentile(FUniqID, 0.91) | +---------------------------+ | 8.749975206154981e+18 | +---------------------------+ 1 row in set (2.107 sec) Doris> select percentile_array(FUniqID, [0.12, 0.23, 0.34, 0.45, 0.56]) from hits_100m; +------------------------------------------------------------------------------------------------+ | percentile_array(FUniqID, [0.12, 0.23, 0.34, 0.45, 0.56]) | +------------------------------------------------------------------------------------------------+ | [0, 5.097819197233503e+18, 5.68906185719365e+18, 6.281280528073601e+18, 6.869583632113269e+18] | +------------------------------------------------------------------------------------------------+ 1 row in set (5.903 sec) Doris> select percentile_array(FUniqID, [0.12, 0.23, 0.34, 0.45, 0.56, 0.67, 0.78, 0.89, 0.91]) from hits_100m; +--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | percentile_array(FUniqID, [0.12, 0.23, 0.34, 0.45, 0.56, 0.67, 0.78, 0.89, 0.91]) | +--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | [0, 5.097819197233503e+18, 5.68906185719365e+18, 6.281280528073601e+18, 6.869583632113269e+18, 7.459044216605808e+18, 8.044902013692362e+18, 8.640523572825436e+18, 8.749975206154981e+18] | +--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (8.866 sec) ```
# Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you under the Apache License, Version 2.0 (the # "License"); you may not use this file except in compliance # with the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, # software distributed under the License is distributed on an # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY # KIND, either express or implied. See the License for the # specific language governing permissions and limitations # under the License. # fe-common This module is used to store some common classes of other modules. # spark-dpp This module is Spark DPP program, used for Spark Load function. Depends: fe-common # fe-core This module is the main process module of FE. Depends: fe-common, spark-dpp